Amino-functionalized Al-MIL-53 for dimethoate pesticide removal from wastewater and their intermolecular interactions

Aluminum-organic framework was reformed with various amount of amino-group (Al-(BDC)(x)(BDC-NH2)(1-x), x = 0.00, 0.25, 0.50, 0.75 and 1.00). The technique used to modify the aluminum-based metal-organic framework was the mixed bonding method. All prepared metal-organic frameworks exhibited the same structure as that of Al-MIL-53. The surface areas of amino-functionalized aluminum-based metal-organic framework showed (S-BET = 866, 1105, 1260, 1100 and 1060 m(2)g(-1)) for Al-BDC, [Al-(BDC)(0.75)(BDC-NH2)(0.25)], [Al-(BDC)(0.5)(BDC-NH2)(0.5)], [Al-(BDC)(0.25)(BDC-NH2)(0.75)] and Al-BDC-NH2, respectively. Amino groups have a great effect on organophosphorus insecticide dimethoate adsorption capability. Pesticide adsorption capacities of Al-BDC, [Al-(BDC) (0.75)(BDC-NH2)(0.25)], [Al-(BDC)(0.5)(BDC-NH2)(0.5)], [Al-(BDC)(0.25)(BDC-NH2)(0.75)] and Al-BDC-NH2 were 154.8, 267.2, 513.4, 344.7 and 266.9 mg g(-1), respectively. Fortunately, the results show that Al-(BDC)(0.5)(BDC-NH2)(0.5) is the best absorbent Al-MOF ratio to reduce dimethoate residue in wastewater. Monte Carlo simulation was used for evaluation of the dimethoate adsorption mechanism. (C) 2020 Elsevier B.V. All rights reserved.

Automated summary

The study focused on the adsorption behavior of dimethoate insecticide by amino-functionalized aluminum-based metal-organic frameworks. Results indicated a significant impact of the amino group content in the modified materials on adsorption efficiency, with the material containing 50% amino groups showing the best performance.